I don't know how many of you have experienced this problem but we have encountered this issue quite a few times already. We stumbled upon this problem at the last part of the Raid when fighting Crota. When one kills the sword bearer and picks it up, sometimes the sword will vanish from the guardians hands leaving him without a sword! This bug needs to be addressed immediately! Its is not a fun experience to be close to defeating this boss and then have a sword vanish from your hands as soon as you have picked it up from the sword bearer.